Oil pump



Patented Mar. 22, 1938 Claims.

. 'Ihis inventionis directed .to an in'iprovement in oil. pumps designed .more particularly" for use in connection with engines of various types.

4The primary` object of the invention' is me provision of a pump made up ,ofu two relatively movable main parts, one of which is formed with recesses and-spaced abutments with slides oper- .ating in the'recessesand limited in-movement by the other-main part, one of themain parts being formed with a plurality of oil pipes and'connected with .a source of supply and servingvas delivery pipes to the pump and with yother oil pipes connected with engine A*parts to be lubricated and serving Vas delivery pipes from the pump; the

relatively movable main parts being arranged'in sealing cooperation and the relative movement v of the main partsutilizing the cooperation of the vslides and abutments toalternately create suction'areas in therecesses `for drawing a supply of oil from thesource. of supply and pressure chambers in the recesses for the delivery oioil through the delivery pipes to the place of use.

, The'invention is illustrated in the accompany- 4 ing drawings, in which:

Figure l is a plan View, partly 'inhorizontal section, showing the improved pump.l l

Figure 2 is an enlarged broken vertical section with the pipes in elevation, showing the slides in one position in -the-recesses resultant from one stroke oi' thepump. f

Figure 3 is a. similar-view showing the slides in `the opposite position resultant from theopposite stroke of4 thee-pump.

' Figure 4 is a section ,on the Figure 5 is a similar section showing a. slightly modified form pt construction. Figure is a view similar to Figure 2, showing a modiledform oifslide. .f Figure 7 is a. plan -view `showing the vpump constructed inlinear lform rather Vthan* in the circular form of Figurev 1, the details .of the pump being omitted from Figure '1. lFigure 8 is a. plan view showing a duplication of the form 4of thepump in that two concentrically arranged pumps'are provided, the pump details being in accordance. with ythose shown in Figurel -1 and being omitted from Figure 8 for .the

sake of clearness.

Figure 9 isa transverse sectional view*r through a circular form' of pump,- wherein the pumpde- 4 tails are v'dupliqmLted in superimposed'relation.

Figure 10 isy a vertical section through the pump structureilshowing a modiiied arrangement .of-

the main cooperating parts.

e 11 'is a plan -view showing a modied line `-l o! Figure 2.'

' -for a-purpose which will'later appear.

arrangementof the main parts in that they are arranged side by side' in the saine horizontal plane, the details of the pump being omitted for the sake o fclearness. v

In the form shown in Figures 1, .2, 3 and 4,

the pump is circular in plan and made up of a lower main part or member 3 and an upper main part or member 2. These parts are mounted for relative reciprocating movement in the rotary plan'ein which they are arranged and it will be seen from Figure 4 that preferably the main part 3, constituting the lower part, has side walls which provide a sliding channel for the other main` part 2, constituting the upper part.l The ,upper and lower parts lhave sealing cooperation at their juncture and in the lower part are formed spaced vertical abutments I2 providing recesses I5 between them, with such recesses openingthrough the uppersurface of the lower part but not extending through the 4full vertical dimension of the lower part. I Y

Slides I4 are mounted for sliding movement in the recessesl l5, the slides being of materially less length than the same dimension of the recess. The slides iill the recesses except in length and are provided with upstanding projections I6 seating in openings .IIin the uppermember, providing a lost motion connection for the slide which, however, is of such dimension that in the rela tive lmovements of thelmain parts, the slides will, at the start of each of such movements, remain at rest for a predetermined partof the movement Suction pipes I0 and II extend through the upper main member 2 and open to the upper suriace at the line of contact between the members 2 and 3, these pipes I 0 and II being arranged in pairs for each' abutment I2.- Delivery pipes 4, 5, 6, 1, 8 and 9, as shown, extend through the upper member 2 and between the line of contact between the members 2 and 3. The delivery pipes, which' of course will be an appropriate number according `to the size of the pump, are arranged in pairs,

with the pipes of each pair on opposite sides of .the pair o1' suction pipes, as will be plain from 4 Figure 2. v

The respective end walls of the abutments I2 are cutaway at theirzupper ends, merging into the Iineofconta'ctbetween the upper and lower members. 'I'hese cut-away portions are indicated at I3 and they are provided to permit communication between the respective suction. and delivery pipes and the recesses I5 at proper intervals in the. rotary reciprocatory relative movement of the upper and lower main parts of the pump.

Again referring to Figures 1 to 4, inclusive, attention is called to the fact that the slides I4 are circular in transverse section and that the recesses I5 are formed partly in the lower membei- 3 and partly in the upper member 2, this being merely the preferred detail of this form of structure.

In the operation of the form shown in Figures 1, 2, 3 and 4, and referring to Figure 2 as the initial position of the parts, it will be noted that the slides I4l have been moved to theirA limit in the recesses I5 to the left and that the recesses I5 present open spaces between the right hand ends of the slides and the proximate walls of the adjacent abutment I2. It will be further noted in this position that the suction pipes I are in open communication with these open spaces by means of the cut-away portion I3, those walls of the abutments deiining one boundary of these open spaces.

The main parts 2 and 3 then move relative to each other for the pumping operation and for the sake of this explanation, it will be assumed that the lower part 3 is moving in the direction of the arrow indicated in each of Figures 2 and 3. The initial movement of the plungers I2 from the position shown in Figure 2 toward the position shown in Figure 3 .willcut oil communication between the suction pipes I0 and the then open spaces of the recesses I3. The slides, however, are free to move under the incompressible body of oil in the open spaces until they have reached the limit permitted by the channel I1 in the upper main part 2 which is at a point intermediate of the stroke in one direction of the lower main part 3.

' During this movement the pipes 4, 6 and 8, as shown in Figure 2, are uncovered by the slides and these pipes are in communication with the oil spaces of the recesses I5. This communication between the delivery pipes 4, 6 and 8 and the respective oil charged spaces of the recesses occurs practicallyv when the movement of the slides is interrupted by the end walls of4 the channels I1. The further movement of the abutments I2, of course, creates a pressure on the bodies of oil in the oil spaces oi' the recesses I5 and so forces the oil through the delivery pipes 4, 6 and 8. Byreason of the cut-away `portion I3 in the end walls of the abutments, these pipes 4, 6 and 8 remain in communication with these oil spaces during the full stroke inithis direction of the .lower part'3. Of course, the slides I4 move with the lower part 3 for a portion of this full stroke and are then prevented from further movement by engagement with the end walls oi' the channel I1.

When the movement of the slides is interrupted, such slides r'emain stationary with respect to the ilxed member of the main parts while the movable member of the `main parts continues its movement. The movable member (the lower part 3 being so utilized in the present instance) continues its movement after the movement of the abutment lI2 is interrupted.

This not only creates the necessary pressure in the oil spaces of the channels I but tends tomove the abutment beyond each slide in the direction of movement of the main part with the effect to provide a space forming end portions of the recesses beyond the slide which naturally tends to a vacuum condition in such space because it is closed against the admission of Athese respective parts.

of the pump, which are in accordance with the annees As the movable member reaches the limit of itsl stroke in the described direction, the cut-oil.' portions I3 of the abutments I2 register with the suction pipes II. These pipes are then open to the greatly reduced or rareiied spaces described and oil from the source of supply will immediately ll such spaces. As the movable member (3 in this instance) makes its opposite stroke, the exact operation is repeated except of course that in this instance the pressure areas and vacuum areas of the recesses I5 are at the opposite ends of the slides I4. At the limit of this movement, the delivery pipes 5, 1 and 9 are in, communication with the pressure spaces for the delivery of the oil while at the limit of the stroke in this direction the suction tubes I0 communicate with the vacuum spaces.

The movement is a reciprocating one, limited in each stroke as described, and the various suction and delivery pipes are arranged in accordance with the length of stroke to carry out the.J operation described. It is to be noted that the slides I4 serve to create pressure in the pressure spaces and eiiect a rarefaction in the vacuum spaces incident to the movement of the abutments I2, thus providing'automatically for the flow of oil through the pump to the source of supply and the delivery of all' of that oil from the pump to the point of use. 'Y

Figure 5` illustrates a slightly modified form wherein the upper member 2 and the lower member 3 are substantially similar to the preferred form. The recesses I54 are, however, formed with rounded bottoms and straight sides and the slides I4 are shaped to iit the recesses. The slides have the projections I6 to t in the slots I1 in the upper member 2'.

In Figure 6, the construction of the lower member 3" and of the upper member 2" is substantially similar to that previously described except that the pressure and vacuum forming element,

here indicated at I4, is iixed to or integral with the upper member 2 and the pipes are provided with valved elements I9 to prevent returnl flow.

Figure 7 shows the development of the pump in straight form rather than the circular form of Figure 1. Here the upper member 2 and the lower member 3 cooperate in a manner previously described and the illustration is diagrammatically correct as to the outline shape of The remaining portions details illustrated in Figure 1, are omitted from Figure 'l in order to avoidcon'fusion.

Figure 8 shows a duplication of the pump shown in Figure l, wherein the upper member 2b and lower member 3h are duplicates of thevparts 2 and 3 of Figure l. In this form, however, there is an additional pump structure arranged in duplication'of, concentric with, and inwardly of the outer pump. In this duplication, the members 2 and3 of the preferred form, here indicated as members 2e and 3, are in all respects duplicates of the form shown in Figure l except that the inner pump is of less diameter than the outer pump disposed in the same horizontal plane and inwardly concentric with the outer pump. The pump details are omitted from this disclosure for the sake of clearness. l

In Figure 9, the construction of the pump details except in the particulars noted, are duplicates of those shown in Figure 1 and are largely omitted from Figure 9 for the sake of clearness. The essential feature shown in Figure 9 is that the element corresponding to thelower member f shown in Figure 9 is in effect a double pump, pro- Y v' 2,111,632 A of the slide, loperation of the movable part 3 of Figure 1 is here shown as an intermediate member 3d and this member is formed on its opposite sides with channels I ild receiving slides Md and elements corresponding to the upper member 2 of the preferred form, and here shown at 2d, cooperate with the slides Md exactly as in the preferred form. 'I'he elements of the pump, other than as illustrated, are duplicates of `those shown in Figure 1 and are omitted-from.

Figurel 9 for.the sake of clearness. This form v'iding one main member in cooperation with two other main members, with the respective pumps arranged inl superimposed relation.

In Figure 10, there is a further modification of the pump form in that themember corresponding to the upper member 2, and indicated in Figure 10 as 2, is 'arranged inwardly of an outer member 3e corresponding to the lower member 3 of the preferred form. These members have their meeting faces on a line 20 inclined to the vertical and the channels indicated in Figure 10 at I5e are formed preferably in the lmeeting faces of each of the members. The slides HIe operate in this form as in .the preferred` form and the remaining details of the form are omitted for the sake of clearness, as such would be a substan.- tial duplication of the parts shown in Figure 1.

Figure 11 shows therespective main parts arranged in the same horizontal plane and iny straight rather than circular form, 'I'he member corresponding to the upper main member 2 of the preferred lform is shown in Figure 11 at 2f` while the cooperating member corresponding to the lower member 3 of the preferred form is shown in Figure 11 at 3f. These main members of `Figure 11 meet on a at surface which is directly vertical with respect to the length of the pump. The operating parts of the form shown in Figure 11 are duplicates of the operating parts of the.

preferred form and are omitted from the showing in Figure 11 for the sake vof clearness.

I claim:

1. An' oil pump made up of two ,relatively movable parts, one such part` being xed, the movable part having sealing sliding contact with the fixed part and formed with oil receiving recesses, a slide in each recess and of less length than the recess, the slide having otherwise a sealing interflt with the walls of the recess, cooperating means on the fixed part and slide to limit movementof theslide relative to the recess in'which it is located to. at all times maintain aspace between one end wall of the recess and the proximate wall in the presence of oil in said space compelling movement of the slide to a limit permitted by the fixed part, the further movement of the movable part being relative to the slide to create a vacuum between the end wall of the recess and the proxithe movable part, and a delivery pipe opening through the fixed part and normally sealed by the slide except at the limit of movement of the slide as determined by the fixed part, whereby in the movement ofthe movable part in one direction the oil contained in the recess between the -end wall thereof and the slide is put under pressure to move the slide to a position to uncover the delivery pipe and force said oil through said delivery pipe during which delivery the movement of the movable vpart creates a vacuum condition at the opposite end of the slide and at the limit movement of the movable part opens the suction pipe to the vacuum space for the inflow of oil.

2. Anoil pump including relatively movable members arrangedV in sealing contact, one of which is provided with' means to admit oil and means to deliver oil, the other .of said members being formed with an oilrecess, a member movable in the recess and of less length than that the member for a linear distance less than that vof. the recess, and means to limit movement of of the recess, the oil admitting means being open to the recess only at the limit of movement of the relatively movable parts, the means for delivering oil being open to the recess only at the limit of'movement of theslide.

3. A construction as defined in claim 2, wherein the part formed with the recess is movable and the part carrying the oil delivery and admitting Y means is fixed.

4. A construction as dened in claim 2, wherein the part carrying the oil delivery and admitting means is xed and the part formed with the recess is mounted for longitudinal reciprocation with respect to the fixed part.

5. A construction as defined in claim 2, wherein the movable part seals the oil admitting means A except in its limit positions, and wherein the oil delivery means is sealed by the.y slide except at the limit movement `of the slide. i

MINORU UESUGI. 

